Using Overlays
Effective Overlay Use Modifying Overlays Moving Objects Between Overlays Frozen Overlays
There are three actions that move objects from one overlay to another.
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When an item is selected, the active overlay combobox in the overlay toolbar will display that item's overlay. (If you select objects in different overlays, the active overlay does not change.) Changing the active overlay when any items are selected will move the objects to a new overlay.
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Groups can only consist of objects in the same overlay. If you group objects from different overlays together, those objects will be moved to the overlay that contains the group. Ungrouping the objects doesn't restore the objects to their original overlays, but Undo will.
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When you delete an overlay, you can choose to remove all objects in the overlay or move them to another existing overlay.